driver/led: Remove unused function
driver/led: Remove unused function

Building with clang:

driver/led/lm3630a.c:23:19: error: unused function 'lm3630a_read'
[-Werror,-Wunused-function]
static inline int lm3630a_read(uint8_t reg, int *val)

BRANCH=none
BUG=b:172020503
TEST=make CC=arm-none-eabi-clang BOARD=aleena

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: If4a26261d41f470c2cb86208e3c1eaada0b2ff3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3202999
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec